Protrusion-bite recorder



April 20 1926.

H. A. BONOFF PIROTRUSIOYN BITEY RECORDER Filed Dec. 1924 Inventor '31;

fit fl. 50214177" Moran 5 Patented Apr. 20', 1926.

HARRY A. BONOFF, or nos ANGELES, CALIFORNIA.

PROTRUSION-IBITE RECORDER.

i 7 Application filed December 12,1924. Serial No. 755,436.

To all whom it may concern Be it known that I, HARRY A, Borrow, a citizen of the UnitedStates, residing at Los Angeles, in the county of Los Angeles and State of California, haveinvented new and useful Improvements in Protrusion Bite Recorders, of which tlie following is a specification. V i This invention relatesto improvements in protrusion bite recorders, which are used by dentists in properly obtaining the inclination of thecondyle paths for the setting up of artificial teeth.

Heretofore protrusion bite recorders have been employed for determining the inclination ofthe condyle path, which recorders may only record when the patient opens his jaw, forces it forward, and then lifts it so as to engage the upper bite block. movement of the lower jaw isunnatural and consequently does not properly record the positions between the upperand lower bite blocks so that when the recorder is applied to an articulator, the inclination of the condyle path as determined by the articulator is notaccurate.

It is therefore an object of this invention to provide a protrusion bite recorder which will enable the patient to move his lower jaw forward while the upper and lower bite blocks are in approximate engagemenhand to provide means forsecuring the upper and lower bite blocks in any position which they may assume. l l

'With the foregoing and other objects in view which will be made manifest in the following detailed description andpointed out in the appended claims, reference is had to the accompanyingfdrawings for an illus-' .trative embodimentof the invention, where- 1n: Figure 1 is a perspective view of theimproved protrusion. bite recorder; Y

Fig. 2 is a top plan viewof the bottom memberor plate of the recorder;

f" 5 Fig. 3 is a vertical section taken substantially on the linej3- 3 of Fig. 2;

Fig. 4 is a top plan. view of the upper plate ormember of the recorder; Fig. 5 is a side elevation of themember shown in Fig. 4;

Fig. 6 is a vertical section, supposedly through a patients mouth, showing the bite blocks and recorder in position therein; and

This I Fig. 7 is a side elevation and a more or less diagrammatical View of an articulator in connection with which the improved protrusion bite recorder is adapted to be used.

Referring to the accompanying drawings wherein similar reference characters designate similar parts throughout, it is believed that in order to understand the advantages of the improved protrusion bite recorder, 1

a brief descriptionof the stepsemployed in making a' dental plate is necessary. Referring to Fig; 6, a mold is first taken of the top '1 of the patients mouth and a similar mold is taken of thebottom or lower aw B. A; sultable cementitious material is then poured into the molds taken soas to form a counterpart similitude of the top and bottom of the patients month. When this is done a'base plate 10 is provided which snug 1y fits against the top of the patients mouth,

and 'a similar base plate is provided which fits upon the bottom of the patients mouth. VVaX as indicated at 12isthenbuilt upon the base plate 10 and wax 13 is built upon the base plate 11. The base plate 1O with the wax 12 which takes the place of teeth constitutes an upper bite block, and thebase plate 11 together with the wax 13, which,

wax takes the place of the lower teeth, constitutes a lower bite block. These bite blocks may then be mounted upon a face bow or similar'device, as disclosed in my prior Patent, N 0. 1,497,259, issued June 10,1924. In

this manner, the central position between the jaws or top and bottom ofthe patients' mouth may be determined with respect to the condyle when the lower jaw is in normal rest position. I 1

When the face bow together with the bite blocks is a plied to an artic'ulator,as disclosed in Fig.7, the counterparts of the top andbottom of the patients mouth may be located with respectto one point'on the patients condyle path. As shown in Fig. 7, .the articulator consists of a base 14 having standards 15, within which are ,rotatably mounted discs 16 having slots 17. An upper member 18 carries balls or pins 19 which are slidable in the slots 17 When the face bow is so applied, the balls or pins 19 occupy a position in the slots 17, which is adjacent the center of the discs 16. p The bite blocks carried by the face bow assume a definite relation with respect tothe centers of the discs 16. The casts indicated at 20 and 21 of the top and bottom of the patients mouth are then caused to fit within the base plates 10 and 11 respectively. The cast 21 of the lower part of the patients mouth is then se cured to the base 14 as by plaster of Paris 22, or the like; and the cast 20 of the roof of the patients mouth is secured to the upper member 18 as by plaster of Paris 23. In this manner, the casts 20 and 21 bear a deiinite relation with respect to the .discs 16, and when the pins 19 are in the ends of the slots 17 adjacent the centers of the discs 16, the upperand lower casts 20 and 21 will bear a relation to each other corresponding to the top and bottom of the patients jaws when in normal position.

In determining the inclination of the con- ,dyle path, it is necessary to record the relation which the jaw or mandible bears to the patients upper jaw when the lower one is protruded. After the casts 20 and 21 are mounted upon the articulator, the bite blocks are'then mounted upon the protrusion bite recorder, as disclosed in Fig. 1. This recorder consists of upper and lower plates 25 and 26, which are preferably Ushaped in form. The upper plate '25 carries an arm or stem 27 upon which is rotatable and slidable a split clamping collar 28. A similar clamping collar 29 is secured to the clamping collar 28 by means of a threaded bolt which extends through both of the adjacent ends of the clamping collar 29 and through the adjacent ends of the clamping collar 28. A wing or thumb nut 31 is threaded on to the bolt 30 and upon tightening causes the adjacent ends of both of the clamping collars 28 and 29 to be drawn together. The clamping collar 29 is axially slidable and rotatable upon a pin 32. Then the wing nut 31 is tightened, the arm 27 can neither rotate in nor slide in the clamping collar '28, and

the clamping collar 29 can neither rotate upon or axially slide upon the pin 32.

v The lower plate 26 carries an ar1u133 upon which is rotatable a clamping collar 34, which clamping collar is similar in construction to the clamping collars 28 and 29. The pin '32 is rigidly SQCUFGdztO the clamping collar 34;. A bolt 35 extends through the adjacent ends of the clamping collar 34 and is :adaptedito be tightened by a wing nut 36, which wing nut upon tightening the bolt 35 prevents the clamping collar 34: from rotating upon the arm 33.

Suitable prongs 37 are formed on the plate 25 and are adapted to be forced into the wax 12 of the upper bite block, as indicated in Fig. 6. Similar prongs 38 are formed 'upon the lower plate 26 and are adapted to be forced into the wax 13 upon.

the lower bite block. Portions of the lower plate :26 are struck out, as indicated at .39, so as to provide leaf springs which engage the upper plate 25 so as to normally urge the plates into spaced relatiouwithrespect to each other. When the upper and lower bite blocks are mounted upon the protrusion bite recorder by forcing the prongs 37 and 38 into the wax 12 and 13, the bite blocks and bite recorder are then inserted into the pa'tients mouth. The patient by closing his mouth may force the bite blocks toward each other, as indicated in Fig. 6, so that the plates 25 and 26 will be disposed adjacent each other against the action of the leaf springs 39. While in this position, the patient may move his lower aw forward while maintaining the plates 25 and 26 in contact with each other. This movement is a natural movement as distinguished from the devices heretofore provided, where the patient necessarily first dropped his lower jaw, then forced it forwardly, and then caused it tov be drawn upwardly. After the patient has forced. his lower jaw forwardly with the plates 25 and 26 in contact, the thumb nuts or wing nuts 31' and 36 are both tightened, and the plates 25 and 26 are thus maintained in adjusted position with respect to each other.

The recorder with the bite blocks therein is then transferred to the articulator. The lower bite block whichis mounted upon the lower plate 26 is then placed back upon the cast 21. Because of the changed relation between the upper and lower bite blocks, the cast 20 will not fit into the upper bite block until the upper member 18 has been manipulated. When the cast 20 is forced or caused to fit within the upper bite block or base plate, the balls or pins 19 will be caused to assume a position within the slots 17 similar to that shown. The position of the slots 17 within the-discs 16 then indi cates the inclination of the condyle path of the patient. Suitable set screws 40 may be used for maintaining the discs 16 in such position, and in this manner the articulator may be easily and accurately set to indicate the inclination of the condyle path of the patient. 7

Because of the faetthat the clamping collars 29 and 28are rotatable as well as slidable upon their respective members, the plates 25 and 26 may assume any position with respect to .each other that is necessary in recording the position of the mandible while protruded, and ifjthe lower jaw has merely a point of engagement with the upper jaw when in protruded position, the leaf springs 39 prevent the upper and lower bite blocks from disengaging the patients mouth; in other words, the upper and lower bite blocks will be always maintained vin-engagement with the top and bottom of the patients'mouth.

It will be understood that various changes in the detail of construction may be made Without departing from the spirit or scope of the invention as defined by the appended claims. 7

I claim:

1. A protrusion bite recorder comprising a pair of. U-shaped plates, an arm carried by one of said plates, a clamping collar rotatable upon said arm, means for clamping said collar upon said arm, a pin carried by said clamping collar, a second clamping collar rotatable upon and adapted to be clamped upon said pin, a second arm carried by the other plate, a third clamping collar pivoted to said second clamping collar and rotatable upon said second arm, and means for clamp ing said third clamping collar against rotation with respect to said second clamping collar and said second arm.

2. A protrusion bite recorder comprising a pair of U-sha ed plates, an arm carried by one of said pFates, able upon said arm, means for clamping said collar upon said arm, a pin carried by said clamping collar, a second clamping collar rotatable upon and adapted to be clamped upon said pin, a second arm carried by the other plate, a third clamping collar pivoted to said second clamping collar and'rotatable upon said second arm, and means for. clamping said third clamping collar against rotation with respect to said second clamping collar and said second arm, there being prongs formed upon said plates for securing a bite block thereto.

a pair of U-shaped plates, an arm carried by one of said plates, aclamping collar rotatable upon said arm, means for clamping said collar upon said arm, a pin carried by said clamping collar, a second clamping collar rotatable upon and adapted to be clamped upon said pin, a second arm carried by the other plate, a third clamping collar pivoted to said second clamping collar and rotatable upon said second arm, means for clamping said third clampin collar against rotation with respect to sai second clamping collar and said second arm, and spring means interposed between said plates for urging said.

a clamping collar rotat-.

5. A protrusion bite recorder comprising plates into spaced relation with respect to each other. c

4. A protrusion bite recorder comprising a pair of plates, an arm secured to eachplate, a pin connecting said arms, means permitting said pin to rotate about one of said arms, means permitting the other arm to slide axially with respect to said pin and to rotate with respect thereto, and. means for clamping said pin in any adjusted position with respect to said arms.

5. A protrusion bite recorder comprising a pair of plates, an arm secured to each plate, a pin connecting said arms, means permitting said pin to rotate about one of said arms, means permitting the other arm to slide axially with respect to said pin and to rotate with respect thereto, means for clamping said pin in any adjusted position with respect to said arms, and prongs formed upon said plates 'for securing a bite-block thereto."

6. A protrusion bite recorder comprising a pair of plates,v an arm secured to each a two members, an arm rigidly connected to each member, a pin, and clamping means connectingeach arm to the pin, said clamping means permitting each armto rotate upon its own axis relatively to the pin and permitting one of the arms to swing about the axis of the pin, saidclamping means also permit-ting one of the arms to slide upon its axis relatively to the pin. v

In testimony whereof I have signed my name to this specification.

.HARRY'A. BONOFF, 

